Craig Mayer, Nick WIlliams, Vojtech Huser
Lister Hill National Center for Biomedical Communications, National Library of Medicine, NIH, Bethesda, MD

See the full regCTG repository at https://github.com/lhncbc/CRI/tree/master/regCTG

To return to the list of conditions and view other reports go to https://lhncbc.github.io/CRI/regCTG/regCTG-condition_report_links.html


Study Counts

Type Study_count
Total_Studies 1677
interventional 1052
Observational 510
Registry 115

Studies over Time

```

Interventional Trials

Intervention Type

intervention_type Study_Count
Device 252
Drug 219
Procedure 205
Other 95
Drug|placebo 85
Behavioral 48
Device|Drug 23
Drug|Procedure 22
Device|Procedure 18
Device|Other 14
Diagnostic Test 14
Drug|Other 11
Behavioral|Other 7
Other|Procedure 7
Device|Drug|Procedure 5
Behavioral|Device 3
Diagnostic Test|Other 2
Dietary Supplement 2
Dietary Supplement|placebo 2
Drug|Other|Procedure 2
Drug|placebo|Procedure 2
Genetic 2
Behavioral|Drug 1
Behavioral|Genetic 1
Biological 1
Biological|Device 1
Biological|placebo 1
Combination Product 1
Device|Drug|Other 1
Device|Other|Procedure 1
Dietary Supplement|Drug|Other 1
Drug|Genetic 1
Drug|Other|placebo 1
placebo|Procedure 1

Count of Studies by Intervention (normalized and mapped)

Interventions over Time

Weekly studies for each intervention

Studies by Country

Country Study_Count
United States 252
Canada 77
Germany 50
United Kingdom 47
NA 45
Korea, Republic of 41
France 35
China 34
Denmark 27
Italy 25
Netherlands 22
Japan 20
Spain 20
Russian Federation 17
United States|Canada 17
Norway 14
Sweden 14
Belgium 11
Brazil 8
Czechia 7
Finland 7
Switzerland 7
Israel 6
Poland 6
Taiwan 6
Austria 5
Australia 4
Czechia|France 4
Egypt 4
Greece 4
Hong Kong 4
Iran, Islamic Republic of 4
United States|Russian Federation 4
France|Germany 3
Australia|Canada 2
Croatia|Czechia 2
Czech Republic 2
Czech Republic|Germany 2
Israel|Russian Federation 2
Lebanon 2
Malaysia 2
Netherlands|Spain 2
Turkey 2
United States|Argentina|Australia|Austria|Belgium|Brazil|Canada|Chile|Czech Republic|Denmark|Finland|France|Germany|Greece|Hong Kong|Hungary|Italy|Malaysia|Mexico|Netherlands|Norway|Poland|Portugal|Singapore|South Africa|Spain|Sweden|Switzerland|Taiwan|United Kingdom 2
United States|Belgium|Netherlands 2
United States|Canada|Korea, Republic of 2
United States|Germany 2
United States|Italy 2
United States|Netherlands 2
Argentina|Australia|Belgium|Croatia|France|Germany|Italy|Netherlands|Norway 1
Argentina|Brazil|China|India|Romania 1
Australia|Austria|Belgium|Canada|France|Germany 1
Australia|Austria|Belgium|Netherlands|Russian Federation|Slovakia|United Kingdom 1
Australia|Austria|Denmark|Germany|New Zealand|Spain|Switzerland 1
Australia|Austria|Estonia|Finland|France|Germany|Israel|Italy|Korea, Republic of|Mexico|Netherlands|Portugal|Spain|Switzerland|Taiwan|United Kingdom 1
Australia|Austria|Germany|Hungary|Netherlands|Poland|Russian Federation|United Kingdom 1
Australia|Austria|United States|Argentina|Belgium|Canada|Chile|China|Czech Republic|Estonia|Finland|France|Germany|Italy|Korea, Republic of|Mexico|Morocco|Netherlands|Poland|Russian Federation|Sweden|Tunisia|Turkey 1
Australia|Belgium|Bulgaria|Croatia|Czech Republic|Denmark|Estonia|Germany|Hungary|Lithuania|Netherlands|New Zealand|Poland|Portugal|Romania|Russian Federation|Serbia|Singapore|Slovakia|South Africa|Spain|Sweden|Switzerland|Ukraine 1
Australia|Canada|China|Germany|Israel 1
Australia|Canada|Czech Republic|Denmark|Estonia|Finland|France|Germany|Latvia|Lithuania|Netherlands|Poland|Serbia|Slovakia|Sweden|Ukraine 1
Australia|France|Germany|Hong Kong|Italy 1
Australia|France|Germany|Italy|Portugal|United Kingdom 1
Australia|Germany|Malaysia|New Zealand|United Kingdom 1
Australia|Hong Kong|Singapore 1
Austria|Belgium|Canada|Czech Republic|Germany|Netherlands|Russian Federation|Slovakia 1
Austria|Belgium|Canada|Czechia|France|Hungary|Italy|Japan|Latvia|Netherlands|Spain|Sweden|Switzerland|United Kingdom 1
Austria|Belgium|Czechia|Italy 1
Austria|Belgium|Denmark|France|Germany|Italy|Spain|Switzerland 1
Austria|Belgium|Denmark|France|Ireland|Italy|Netherlands|Switzerland|United Kingdom 1
Austria|Belgium|Finland|Germany|Greece|Ireland|Israel|Japan|Norway|Switzerland|United Kingdom 1
Austria|Belgium|France|Germany|Hungary|Italy|Korea, Republic of|Lithuania|Netherlands|Poland|Portugal|Romania|Serbia|Spain|Switzerland|Taiwan|Ukraine|United Kingdom 1
Austria|Czechia|France|Germany|Italy|Portugal|Spain 1
Austria|Germany|Netherlands 1
Belgium|Bulgaria|Croatia|Czechia|Denmark|Estonia|Hungary|Latvia|Lithuania|Poland|Russian Federation|Serbia|Slovakia|Spain|Ukraine 1
Belgium|Canada|Czechia|Germany|Netherlands|United Kingdom 1
Belgium|Canada|Czechia|United Kingdom 1
Belgium|Canada|Denmark|France|Italy|Spain|Sweden 1
Belgium|Canada|Germany|Italy|Netherlands 1
Belgium|Czech Republic|Denmark|Finland|France|Germany|Hungary|Italy|Netherlands|Poland|Spain|United Kingdom 1
Belgium|Czech Republic|France|Italy|Netherlands|Poland|Spain|Sweden|Switzerland 1
Belgium|Czechia|Denmark|France|Germany|Italy 1
Belgium|Czechia|Denmark|France|Germany|Italy|Netherlands|Poland|Spain|Switzerland|United Kingdom 1
Belgium|Czechia|Denmark|Italy 1
Belgium|Czechia|Germany|Greece|Hungary|Israel|Spain 1
Belgium|Czechia|Germany|United Kingdom 1
Belgium|Czechia|Netherlands 1
Belgium|France|Germany|Hungary|Italy|Netherlands|Poland|Russian Federation|Spain 1
Belgium|France|Germany|Hungary|Netherlands|United Kingdom 1
Belgium|France|Germany|United Kingdom 1
Belgium|Netherlands 1
Brazil|Canada|Sweden|Taiwan 1
Brazil|China|Germany|United States|Argentina|Australia|Austria|Belgium|Bulgaria|Canada|Chile|Colombia|Czech Republic|Denmark|Finland|France|Greece|Hong Kong|Hungary|India|Israel|Korea, Republic of|Lithuania|Malaysia|Mexico|Netherlands|New Zealand|Norway|Peru|Philippines|Poland|Romania|Russian Federation|Singapore|South Africa|Spain|Sweden|Switzerland|Taiwan|Thailand|Turkey|Ukraine|United Kingdom|Venezuela 1
Bulgaria 1
Bulgaria|Czechia|Hungary|Ukraine 1
Bulgaria|France|Germany|Poland|Russian Federation|Turkey|Ukraine 1
Canada|Czechia|Germany|Italy|Netherlands|United Kingdom 1
Canada|Germany 1
Canada|Germany|United Kingdom 1
Canada|Italy|Norway|Spain 1
Canada|United States 1
Chile|China|Germany|Italy|Poland|Portugal|Thailand|Turkey|Ukraine|Argentina|United States|Australia|Belgium|Brazil|Bulgaria|Canada|Colombia|Croatia|Czechia|Denmark|Estonia|Finland|France|Greece|Guatemala|Hungary|India|Israel|Japan|Korea, Republic of|Mexico|Netherlands|New Zealand|Norway|Peru|Philippines|Romania|Russian Federation|Serbia|Slovakia|South Africa|Spain|Sweden|Switzerland|Taiwan|United Kingdom 1
Chile|Czechia|United States|Argentina|Australia|Belgium|Brazil|Bulgaria|Canada|Denmark|France|Germany|Korea, Republic of|Malaysia|Mexico|Netherlands|Poland|Romania|Russian Federation|South Africa|Sweden|Taiwan|Turkey|Ukraine|United Kingdom 1
China|Korea, Republic of|Singapore|Taiwan 1
Colombia|Czech Republic|Denmark|France|Germany|Mexico|Spain 1
Croatia 1
Croatia|Netherlands|New Zealand 1
Cyprus|Greece|Israel 1
Czech Republic|Denmark|Hungary|Netherlands|Norway|Poland|Slovakia|Sweden 1
Czech Republic|France|Italy|Netherlands|Serbia|Slovakia|United Kingdom 1
Czech Republic|Germany|Spain 1
Czechia|France|Germany|Hungary|Italy|Netherlands|Spain|Switzerland 1
Czechia|Germany 1
Czechia|Germany|Netherlands|Poland|United Kingdom 1
Czechia|Hungary|Italy|Poland|Spain 1
Czechia|Italy|United Kingdom 1
Czechia|Japan 1
Denmark|Finland|Germany|Hungary|Netherlands|Norway|Poland|Sweden 1
Denmark|Finland|Norway|Sweden 1
Denmark|Germany|Netherlands|Switzerland 1
Denmark|Netherlands 1
Denmark|Norway|Poland|Russian Federation|Slovakia|Sweden 1
Denmark|Norway|Poland|Russian Federation|Sweden|United Kingdom 1
Denmark|Norway|Sweden 1
Denmark|Russian Federation|Sweden 1
Denmark|Spain 1
Denmark|United States|Canada|Sweden 1
Denmark|United States|Sweden 1
France|Australia|Austria|Bulgaria|Czech Republic|Estonia|Germany|Hungary|India|Israel|Japan|Korea, Republic of|Malaysia|Netherlands|Philippines|Poland|Russian Federation|Slovakia|South Africa|Spain|Thailand|Ukraine|United Kingdom 1
France|Belgium|Germany|Italy|Spain|Switzerland|United Kingdom 1
France|Germany|Greece 1
France|Germany|Spain|United Kingdom 1
France|Japan|Netherlands 1
France|United States|Australia|Canada|Denmark|Italy|Netherlands|New Zealand|Poland|United Kingdom 1
France|United States|Switzerland 1
Germany|Greece|Netherlands|Poland|Serbia|Switzerland|United Kingdom 1
Germany|Hungary|Spain 1
Germany|Italy|Spain|United Kingdom 1
Germany|Italy|Sweden 1
Germany|Spain|United Kingdom 1
Germany|Switzerland 1
Germany|United Kingdom 1
Germany|United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|Chile|Colombia|Croatia|Czechia|Denmark|Finland|France|Greece|Hong Kong|Hungary|India|Ireland|Israel|Italy|Japan|Korea, Republic of|Mexico|Netherlands|New Zealand|Norway|Poland|Portugal|Russian Federation|Singapore|Slovakia|Slovenia|Spain|Sweden|Taiwan|Thailand|Turkey|United Kingdom 1
Greece|Netherlands 1
Greece|Russian Federation 1
Hungary|Netherlands 1
India 1
Ireland 1
Israel|United States|Belgium|Canada|Denmark|Germany|Italy|Japan|Korea, Republic of|Romania|Spain|Sweden 1
Italy|Switzerland 1
Italy|United Kingdom 1
Mexico 1
Netherlands|Belgium 1
Netherlands|Switzerland|United Kingdom 1
Netherlands|United Kingdom 1
New Zealand|Singapore|Australia|Hong Kong|Japan|Korea, Republic of|Malaysia|South Africa|Taiwan|Thailand 1
Nigeria 1
Poland|United States|Germany|Israel|Italy|Netherlands|United Kingdom 1
Romania 1
Romania|Bulgaria|United States|Austria|Belgium|Czechia|Denmark|France|Germany|Hungary|Israel|Italy|Netherlands|Poland|Russian Federation|Spain|Sweden|Ukraine|United Kingdom 1
Singapore 1
South Africa 1
Spain|Switzerland|Japan|Netherlands|Norway|United States|Austria|Denmark|Germany|Greece|Italy|United Kingdom 1
Spain|United States|Canada|China 1
Sweden|United Kingdom 1
Taiwan|Belgium|Canada|Czechia|Germany|Hungary|Italy|Korea, Republic of|Poland|Spain|United Kingdom 1
Tunisia 1
United Kingdom|United States|Belgium|Canada|France|Germany|Italy|Japan|Netherlands|Russian Federation|Spain 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|Chile|Colombia|Croatia|Czechia|Denmark|France|Germany|Hungary|India|Israel|Italy|Korea, Republic of|Mexico|Netherlands|Norway|Peru|Poland|Portugal|Puerto Rico|Romania|Russian Federation|Serbia|Slovakia|Spain|Sweden|Switzerland|Ukraine|United Kingdom|Virgin Islands (U.S.) 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|China|Colombia|Czechia|Denmark|Finland|France|Germany|Greece|Hong Kong|Hungary|India|Israel|Italy|Japan|Korea, Republic of|Malaysia|Mexico|Netherlands|Norway|Peru|Philippines|Poland|Portugal|Romania|Russian Federation|Singapore|Slovakia|South Africa|Spain|Sweden|Switzerland|Taiwan|Thailand|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Canada|Chile|China|Colombia|Czechia|Denmark|Finland|France|Germany|Greece|Hong Kong|India|Indonesia|Israel|Italy|Korea, Republic of|Malaysia|Mexico|Norway|Philippines|Poland|Russian Federation|Singapore|South Africa|Spain|Sweden|Taiwan|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Austria|Belgium|Brazil|Canada|Chile|China|Colombia|Czechia|Denmark|Finland|France|Germany|Hong Kong|Hungary|India|Israel|Italy|Japan|Korea, Republic of|Malaysia|Mexico|Netherlands|Norway|Peru|Philippines|Poland|Puerto Rico|Romania|Russian Federation|Singapore|South Africa|Spain|Sweden|Switzerland|Taiwan|Turkey|Ukraine|United Kingdom 1
United States|Argentina|Australia|Austria|Belgium|Canada|Chile|China|Czech Republic|Finland|Germany|Greece|Hong Kong|Hungary|India|Israel|Italy|Korea, Republic of|Malaysia|Mexico|Morocco|Netherlands|New Zealand|Norway|Philippines|Poland|Portugal|Russian Federation|Singapore|South Africa|Spain|Sweden|Taiwan|Thailand|Tunisia|Turkey|United Kingdom 1
United States|Argentina|Australia|Canada|Chile|Denmark|France|Germany|Hungary|Italy|Japan|Netherlands|Poland|Russian Federation|Spain|Sweden|Switzerland 1
United States|Argentina|Australia|Canada|South Africa 1
United States|Argentina|Belgium|Brazil|Canada|Denmark|Estonia|France|Germany|Greece|Hungary|India|Italy|Korea, Republic of|Latvia|Mexico|Netherlands|New Zealand|Norway|Romania|Spain|Sweden|Taiwan|Thailand|United Kingdom 1
United States|Argentina|Canada|Chile|Denmark|Mexico|Sweden 1
United States|Argentina|Canada|Denmark|India|Poland 1
United States|Argentina|Canada|Denmark|South Africa|Sweden 1
United States|Argentina|Czech Republic|Former Serbia and Montenegro|Germany|Israel|Poland|Romania|Russian Federation|Slovakia|South Africa|Ukraine|United Kingdom 1
United States|Australia 1
United States|Australia|Austria|Belgium|Brazil|Bulgaria|Canada|China|Czech Republic|Denmark|Finland|France|Germany|Greece|Hong Kong|Hungary|India|Israel|Italy|Korea, Republic of|Malaysia|Netherlands|Norway|Philippines|Poland|Portugal|Romania|Russian Federation|Singapore|Slovakia|Sweden|Switzerland|Taiwan|Thailand|United Kingdom 1
United States|Australia|Belgium|France|Germany|Netherlands|Spain 1
United States|Australia|Brazil|Canada|India|Israel|Latvia|Lithuania|Poland|Russian Federation|South Africa|Ukraine|United Kingdom 1
United States|Australia|Canada 1
United States|Australia|Canada|China|Czechia|Germany|Italy|Korea, Republic of|Russian Federation|United Kingdom 1
United States|Australia|Canada|Netherlands 1
United States|Australia|Czechia|France|Germany|Portugal|Spain|Sweden|United Kingdom 1
United States|Australia|Germany|Italy 1
United States|Austria|Belgium|Canada|France|Germany|Italy|Japan|Korea, Republic of|Netherlands|Poland|Spain|Switzerland|United Kingdom 1
United States|Austria|Belgium|Denmark|Germany|Italy|Netherlands|Spain|United Kingdom 1
United States|Austria|Canada|Germany|Italy|Netherlands|Spain|Sweden|United Kingdom 1
United States|Austria|Germany|Italy|Netherlands|Slovenia|Spain 1
United States|Belarus|Belgium|Bosnia and Herzegovina|Canada|Chile|Latvia|Mexico|Moldova, Republic of|Russian Federation|Slovakia|Ukraine 1
United States|Belgium|Brazil|Canada|China|Denmark|Finland|France|Germany|Greece|Italy|Netherlands|Portugal|Singapore|South Africa|Spain|United Kingdom 1
United States|Belgium|Canada|Czechia|Denmark|Germany|Hungary|Italy|Netherlands|Norway|Spain|Switzerland|United Kingdom 1
United States|Belgium|France|Germany|United Kingdom 1
United States|Belgium|Germany 1
United States|Belgium|Germany|Netherlands 1
United States|Brazil|Canada|Czechia|Italy 1
United States|Bulgaria|Germany|Hungary|Italy|Poland 1
United States|Canada|Czech Republic|France|Germany|Hungary|Italy|Netherlands|Portugal 1
United States|Canada|Czechia|France|Italy 1
United States|Canada|Czechia|Germany|Italy 1
United States|Canada|Denmark|Netherlands 1
United States|Canada|Germany 1
United States|Canada|Hungary|Netherlands|Poland|Serbia 1
United States|Canada|Japan 1
United States|Colombia 1
United States|Czech Republic|Germany 1
United States|Czech Republic|Poland|Russian Federation|Ukraine 1
United States|Czechia|France|Italy 1
United States|Czechia|Germany 1
United States|Czechia|Russian Federation 1
United States|Germany|Netherlands 1
United States|Greece|Russian Federation 1
United States|Hungary|Italy|Saudi Arabia|Slovakia|South Africa|United Kingdom 1
United States|Israel 1
United States|Japan 1
United States|Puerto Rico 1
United States|United Kingdom 1

Sites per Study

Site_count Study_Count
1 626
2 77
3 40
4 29
5 14
6 16
7 16
8 10
9 9
10 14
11 8
12 13
13 5
14 3
15 11
16 6
17 6
18 9
19 7
20 6
21 5
22 5
23 7
24 5
25 4
26 5
27 1
28 5
29 2
30 5
31 3
32 2
33 1
34 2
35 1
36 2
37 2
38 5
39 2
40 4
41 1
44 3
49 2
51 1
53 1
54 2
55 1
57 1
58 2
60 1
62 1
64 1
67 2
75 1
81 1
82 1
84 1
87 1
91 1
97 1
100 1
101 1
103 2
111 1
113 1
114 1
116 1
118 1
127 1
129 1
130 1
132 1
152 1
165 2
170 1
178 2
200 1
223 1
230 2
233 1
356 1
421 1
503 1
567 1
626 1
959 1
984 1
1016 1
1113 1

Phase

Phase Study_Count
N/A 608
Phase 4 173
Phase 3 145
Phase 2 86
Phase 1 17
Phase 2/Phase 3 12
Phase 1/Phase 2 7
Early Phase 1 4

Number of Arms

Number_of_Arms Count_of_Studies
1 210
2 652
3 74
4 40
5 5
6 4
7 1
8 1
9 1
10 1
11 1
NA 62

Number of Updates

Count of Versions Count of Studies
1 101
2 154
3 154
4 119
5 106
6 73
7 64
8 61
9 43
10 33
11 26
12 16
13 7
14 15
15 11
16 7
17 7
18 9
19 4
20 1
21 2
22 3
24 1
25 3
26 1
27 2
28 1
29 1
30 2
32 1
33 1
34 1
36 1
37 3
38 2
40 1
44 1
45 1
46 2
48 1
50 2
62 1
63 1
64 1
65 1
76 1
85 1
129 1
131 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 6049 951 6.360673
Contacts/Locations 3369 820 4.108537
Recruitment Status 1410 806 1.749380
None (earliest Version on record) 1052 1052 1.000000
Study Design 1007 642 1.568536
Outcome Measures 840 503 1.669980
Sponsor/Collaborators 590 378 1.560847
Arms 576 378 1.523810
Interventions 576 378 1.523810
Eligibility 536 369 1.452575
Study Identification 520 341 1.524927
Study Description 459 325 1.412308
Oversight 425 350 1.214286
References 195 138 1.413043
Conditions 181 138 1.311594
Results 176 176 1.000000
More Information 163 96 1.697917
IPDSharing 150 130 1.153846
Results Submission Events 68 68 1.000000
Documents 51 45 1.133333
Baseline Characteristics 46 38 1.210526
Participant Flow 37 32 1.156250
Reported Adverse Events 33 26 1.269231
2020 Study Status 2 2 1.000000
Quality Control Review has not concludedReturned: June 24 1 1 1.000000
Quality Control Review has not concludedReturned: March 16 1 1 1.000000

Enrollment Metrics by Phase

Measure Early.Phase.1 N.A Phase.1 Phase.1.Phase.2 Phase.2 Phase.2.Phase.3 Phase.3 Phase.4
Min. 10.0 1.000 13.00000 13.0 3.0000 48.0000 5.000 10.0000
1st Qu. 17.5 60.000 20.00000 23.0 50.0000 60.0000 120.000 80.0000
Median 30.0 122.000 40.00000 50.0 130.0000 205.0000 253.500 176.0000
Mean 30.0 4314.135 60.94118 62.0 220.7882 280.8333 1368.907 768.4566
3rd Qu. 42.5 300.000 58.00000 97.5 234.0000 431.0000 659.250 398.0000
Max. 50.0 1260576.000 280.00000 130.0 1280.0000 800.0000 21105.000 52000.0000

Trial Group Type

group_type Group_Count
Experimental 874
Active Comparator 711
No Intervention 146
Other 145
Placebo Comparator 107
NA 62
Sham Comparator 7

Intervention Model

intervention_model Study_Count
Parallel Assignment 754
Single Group Assignment 247
Crossover Assignment 30
Factorial Assignment 11
Sequential Assignment 5
NA 5

Primary Purpose

primary_purpose Study_Count
Treatment 636
Prevention 199
Diagnostic 83
Other 37
Health Services Research 21
Screening 21
Supportive Care 21
NA 14
Basic Science 12
Device Feasibility 7
Educational/Counseling/Training 1

Observational Studies

Studies by Country

Country Study_Count
United States 112
NA 50
France 36
Germany 35
Spain 22
United Kingdom 22
Korea, Republic of 17
Canada 16
China 16
Sweden 15
Finland 13
Italy 11
Japan 11
Switzerland 10
Netherlands 8
Denmark 7
Greece 6
Norway 6
Belgium 5
Russian Federation 5
Taiwan 5
Turkey 5
Poland 4
Austria 3
Germany|Netherlands 3
Germany|Switzerland 3
Israel 3
Thailand 3
Argentina 2
Korea, Republic of|Taiwan 2
United States|Puerto Rico 2
Argentina|Azerbaijan|Bahrain|Chile|Colombia|Egypt|Georgia|Jordan|Kazakhstan|Kenya|Lebanon|Mexico|Russian Federation|Saudi Arabia|United Arab Emirates|Uruguay|Venezuela 1
Argentina|Canada|Chile|Germany|Italy|Spain 1
Australia 1
Australia|Austria|France|Italy|Portugal|South Africa 1
Australia|Belgium|Canada|France|Germany|Italy|Monaco|United Kingdom 1
Australia|China|Hong Kong|Korea, Republic of|Malaysia|Philippines|Taiwan|Thailand 1
Austria|Belarus|Czech Republic|Finland|Germany|Italy|Netherlands|Portugal|Russian Federation|Slovakia|Slovenia|Spain|Sweden|Switzerland|United Arab Emirates|United Kingdom 1
Austria|Bulgaria|Czechia|Estonia|Hungary|Israel|Latvia|Poland|Romania|Russian Federation|Serbia|Slovenia 1
Austria|Denmark|Finland|Germany|Spain|Sweden 1
Belgium|Denmark|Greece|Netherlands|Norway|Portugal|Sweden 1
Belgium|Ireland|Italy|Netherlands|Portugal|Spain 1
Bulgaria|Czech Republic|Denmark|France|Germany|Slovakia|Spain|United Kingdom 1
Bulgaria|France|Germany|Poland|Russian Federation|Turkey|Ukraine 1
Canada|Netherlands 1
Canada|Sweden 1
China|Croatia|Egypt|Germany|Lebanon|Netherlands|Spain|Turkey 1
Colombia 1
Czech Republic|United Kingdom 1
Czechia 1
Czechia|France|Germany|Netherlands|Spain|Switzerland 1
Denmark|France|Germany|Ireland|Italy|Netherlands|Poland|Spain|United Kingdom 1
Denmark|Germany|Hong Kong|Ireland|Italy|Poland|Spain|Sweden|Thailand 1
Egypt 1
France|Austria|Belgium|Bulgaria|Croatia|Czechia|Denmark|Estonia|Germany|Greece|Ireland|Italy|Latvia|Netherlands|Norway|Poland|Portugal|Romania|Slovenia|Spain|Sweden|United Kingdom 1
France|Germany|Hungary 1
France|Italy|Switzerland 1
Hong Kong 1
Hong Kong|India|Indonesia|Korea, Republic of|Malaysia|Pakistan|Philippines|Singapore|Taiwan|Thailand|Vietnam 1
Hong Kong|India|Korea, Republic of|Singapore|Taiwan|Thailand 1
India 1
Indonesia|Korea, Republic of|Malaysia|Singapore|Thailand 1
Ireland 1
Jordan 1
Lithuania 1
Puerto Rico 1
Romania 1
Slovakia 1
Slovenia|Sweden|Austria|Belgium|Canada|Czech Republic|Denmark|France|Germany|Hungary|Ireland|Israel|Moldova, Republic of|Netherlands|Norway|Poland|Portugal|Russian Federation|Slovakia|Ukraine|United Kingdom 1
Tunisia 1
United States|Argentina|Brazil|Canada|Chile|China|Colombia|Ecuador|Hong Kong|Japan|Korea, Republic of|Lebanon|Mexico|United Arab Emirates|Peru|Russian Federation|Saudi Arabia|Singapore|South Africa|Taiwan|Venezuela 1
United States|Australia|Belgium|France|Germany|Netherlands|Spain 1
United States|Australia|Canada 1
United States|Australia|France 1
United States|Belgium|Canada|Greece|Netherlands 1
United States|Canada 1
United States|Germany|Israel|United Kingdom 1
United States|Greece 1
United States|Monaco 1
United States|Netherlands 1
United States|New Zealand 1
United States|Puerto Rico|Virgin Islands (U.S.) 1
Venezuela 1

Sites per Study

Site_count Study_Count
1 376
2 33
3 15
4 11
5 5
6 6
7 4
8 6
9 6
10 1
11 1
12 1
13 4
15 1
16 1
17 2
18 1
19 2
21 3
22 3
23 1
24 2
26 1
27 1
28 1
29 1
32 1
39 1
40 1
42 1
45 1
47 1
50 1
55 1
56 1
62 1
75 1
100 1
140 1
148 1
161 1
171 1
220 1
523 1
666 1
1164 1
1616 1

Number of Updates

Count of Versions Count of Studies
1 71
2 110
3 83
4 58
5 31
6 22
7 18
8 14
9 18
10 7
11 6
12 4
13 7
14 1
15 3
16 2
17 1
18 6
19 2
20 5
22 4
23 2
24 1
25 2
26 3
27 2
28 2
30 1
31 2
32 1
33 1
34 1
35 1
38 2
40 1
43 1
46 1
50 1
51 1
55 1
57 1
59 1
61 2
63 1
78 1
80 2
118 1
120 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 3313 439 7.546697
Contacts/Locations 1190 341 3.489736
Recruitment Status 554 357 1.551821
None (earliest Version on record) 510 510 1.000000
Study Design 423 283 1.494700
Outcome Measures 231 162 1.425926
Sponsor/Collaborators 155 119 1.302521
Study Identification 145 107 1.355140
Eligibility 143 115 1.243478
Study Description 134 106 1.264151
Oversight 108 98 1.102041
References 102 85 1.200000
Groups 91 77 1.181818
Interventions 91 77 1.181818
Conditions 52 46 1.130435
Results 52 52 1.000000
IPDSharing 48 40 1.200000
Documents 25 25 1.000000
Results Submission Events 25 25 1.000000
More Information 17 12 1.416667
Participant Flow 5 4 1.250000
Baseline Characteristics 3 2 1.500000
Reported Adverse Events 3 2 1.500000

Enrollment Metrics

Measure Observational
Min 5.00
1st Qu 100.00
Median 364.00
Mean 13442.17
3rd Qu 1739.50
Max 814446.00

Observation Model

observational_model Study_Count
Cohort 345
Case-Only 62
Case-Control 31
Other 27
Case Control 19
NA 19
Case-Crossover 3
Ecologic or Community 3
Defined Population, Natural History 1

Time Perspective

time_perspective Study_Count
Prospective 336
Retrospective 128
Cross-Sectional 30
Other 9
NA 6
Longitudinal, Retrospective 1

Registries

Studies by Country

Country Study_Count
United States 18
NA 11
Italy 10
Germany 8
Korea, Republic of 6
Canada 5
China 4
France 4
Egypt 3
Poland 3
Russian Federation 3
Spain 3
Finland 2
Netherlands 2
Singapore 2
Sweden 2
Switzerland 2
Australia|Belgium|Chile|Denmark|Finland|France|Germany|Ireland|Israel|Italy|Netherlands|Norway|Poland|Spain|Sweden|United Kingdom 1
Australia|Hong Kong|Indonesia|Korea, Republic of|Malaysia|Saudi Arabia|Thailand 1
Austria 1
Austria|Belgium|Canada|China|Czechia|France|Germany|India|Italy|Korea, Republic of|Netherlands|Portugal|Saudi Arabia|Spain|United Kingdom 1
Austria|Denmark|Sweden 1
Austria|Germany 1
Belgium 1
Belgium|Austria|France|Germany|Switzerland 1
Belgium|France|Germany|Ireland|Italy|Netherlands|Poland|Portugal|Russian Federation|Saudi Arabia|Spain|United Arab Emirates|United Kingdom 1
Belgium|Netherlands 1
Brazil 1
China|Hong Kong|Japan|Korea, Republic of|Taiwan 1
Colombia 1
Czechia|Germany|Ireland|Spain|United Kingdom 1
Denmark 1
France|Georgia|Germany|Greece|Hungary|Israel|Italy|Korea, Republic of|Netherlands|Poland|Portugal|Spain|Switzerland|United Kingdom 1
France|United Kingdom 1
Greece 1
Indonesia 1
Israel 1
Japan 1
Latvia 1
Netherlands|Russian Federation 1
Tunisia 1
Turkey 1
United Kingdom 1
United States|Argentina|Austria|Belgium|Brunei Darussalam|Chile|China|Colombia|Czechia|Germany|Greece|Hungary|Iceland|Indonesia|Italy|Japan|Kazakhstan|Korea, Republic of|Kuwait|Malaysia|Mexico|Oman|Philippines|Poland|Portugal|Russian Federation|Saudi Arabia|Serbia|Singapore|Slovakia|South Africa|Spain|Switzerland|Taiwan|Thailand|United Arab Emirates|United Kingdom 1

Sites per Study

Site_count Study_Count
1 81
2 7
3 2
4 3
9 4
12 1
13 1
15 1
16 1
20 1
21 2
25 1
41 1
47 1
51 1
62 2
90 1
91 1
98 1
125 1
154 1

Number of Updates

Count of Versions Count of Studies
1 15
2 28
3 26
4 14
5 5
6 4
7 3
8 9
9 1
10 1
11 4
12 2
22 1
25 1
28 1

Update History Change Type

Change Type Count_of_Changes Count_of_Studies ratio
Study Status 389 100 3.890000
Contacts/Locations 200 73 2.739726
None (earliest Version on record) 115 115 1.000000
Recruitment Status 103 68 1.514706
Study Description 62 37 1.675676
Study Design 61 45 1.355556
Outcome Measures 46 38 1.210526
Study Identification 32 27 1.185185
Sponsor/Collaborators 24 19 1.263158
Oversight 23 21 1.095238
Eligibility 21 19 1.105263
Groups 16 14 1.142857
Interventions 16 14 1.142857
Conditions 14 14 1.000000
IPDSharing 13 13 1.000000
References 10 6 1.666667
Documents 6 5 1.200000
Results 5 5 1.000000
Results Submission Events 5 5 1.000000
More Information 1 1 1.000000

Enrollment Metrics

Measure Registries
Min 1.0
1st Qu 250.0
Median 910.0
Mean 118920.4
3rd Qu 2127.0
Max 7205000.0

Registry Model

observational_model Study_Count
Cohort 84
Case-Only 16
Case-Control 6
Other 5
Ecologic or Community 2
Case-Crossover 1
NA 1

Time Perspective

time_perspective Study_Count
Prospective 105
Other 5
Cross-Sectional 3
Retrospective 1
NA 1

Follow-up

target_duration Study_Count
12 Months 22
1 Year 16
2 Years 14
5 Years 11
1 Day 8
3 Years 8
10 Years 5
24 Months 5
1 Month 4
18 Months 2
3 Months 2
30 Days 2
6 Months 2
105 Months 1
12 Weeks 1
15 Years 1
17 Years 1
2 Days 1
3 Days 1
36 Months 1
4 Months 1
4 Weeks 1
4 Years 1
60 Days 1
60 Months 1
8 Weeks 1
90 Days 1